《C语言程序设计》第10章习题答案

1、选择题

（1）B（2）B（3）C（4）B（5）C（6）D（7）A（8）D（9）A（10）C（11）C（12）A 2、填空题

（1）fputc('A',fp);

fputs("Hello!",fp);

（2）fscanf(fp,"%d,%d,%d",&a,&b,&c);

（3）"r"

"w"

"a"

3、程序填空题

#include

score.txt

i+1

"%s",name

scanf("%d",&age);

scanf("%f",&score);

"%s,%d,%f\n"

fclose(fp);

4、程序设计题

（1）#include

void main()

{

FILE *fp;

char c;

if((fp=fopen("d:\\write\\tc\\text1.txt","r"))==NULL)

{

printf("can't open the file\n");

exit(1);

}

else

{

for(c=getc(fp);c!=EOF;c=fgetc(fp))

putchar(c);

fclose(fp);

}

}

（2）#include

void main()

{

char b[10];

FILE *f;

int i;

if((f=fopen("d:\\write\\tc\\file1.txt","rb"))==NULL) exit(0);

else if(fread(b,1,10,f)!=10)

printf("file read error!\n");

for(i=0;i<=9;i++)

printf("%c ",b[i]);

fclose(f);

}

（3）#include

void main()

{

char str[]="Welcome you";

char display[15];

FILE *fp;

char c;

if((fp=fopen("d:\\write\\tc\\file2.txt","w+"))==NULL) {

puts("cannot open the file\n");

exit(1);

}

else

{ fputs(str,fp);

rewind(fp);

fgets(display,15,fp);

puts(display);

fclose(fp);

}

}

（4）#include

void main()

{

FILE *fp;

char ch,filename[10];

puts("please enter the filename:"); scanf("%s",filename);

if((fp=fopen(filename,"w"))==NULL)

{

puts("cannot open the file\n"); exit(0);

}

ch=getchar();

while(ch!='*')

{

fputc(ch,fp);

putchar(ch);

ch=getchar();

}

fclose(fp);

}